package com.fy.springmvc2.exception;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/** 自定义的异常解析器,只要控制器中发生异常并抛出了，就会进入到这个类的异常解析方法中*/

@Component  // 声明组件
public class CustomerExceptionResolver implements HandlerExceptionResolver {
    /**返回的ModelAndView 可以指定显示异常信息的页面 也可以设置异常信息
        request 请求对象，response响应对象，ex 处理器抛出的异常对象*/

//    @Override
//    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
//        ModelAndView modelAndView = new ModelAndView("error");
//        modelAndView.addObject("error",ex);
//        return modelAndView;
//    }


    @Override
    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
        //  只抛出去自定义的异常对象
        CustomerException exception;
        if(ex instanceof CustomerException){
            exception = (CustomerException)ex;
        }else {
            exception = new CustomerException(ex.getMessage());
        }

        ModelAndView modelAndView = new ModelAndView("error");
        modelAndView.addObject("error",exception.getMessage());
        return modelAndView;
    }
}
